package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.exception.CustomException;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    //新增套餐，同时需要保存套餐和菜品的关联关系
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息,执行insert操作
        this.save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) ->{
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //保存套餐和菜品的关联信息, 操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    @Transactional
    //删除套餐，同时需要删除套餐和菜品的关联数据
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态,确定是否可以删除
        LambdaQueryWrapper<Setmeal> lqw = new LambdaQueryWrapper<>();
        lqw.in(Setmeal::getId,ids);
        lqw.eq(Setmeal::getStatus,1);

        int count = this.count(lqw);
        if (count > 0){
            //如果不能删除,抛出一个业务异常
            throw new CustomException("套餐正在售卖中,不能删除");
        }
        //如果可以删除,先删除套餐中的数据 --setmeal
        this.removeByIds(ids);
        //删除关系表中的数据 -- setmeal_dish
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(queryWrapper);
    }



    //根据套餐id查询数据
    public SetmealDto getByIdWithDish(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        //BeanUtils.copyProperties() 拷贝setmeal到setmealDto中
        BeanUtils.copyProperties(setmeal,setmealDto);
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        //将setmealDishList 设置到 setmealDto中
        lqw.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> list = setmealDishService.list(lqw);
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }

    @Override
    @Transactional
    //更新套餐
    public void updateSetmeal(SetmealDto setmealDto) {
        //更新信息
        this.updateById(setmealDto);
        //清理当前的套餐数据
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(SetmealDish::getSetmealId,setmealDto.getId());
        setmealDishService.remove(lqw);

        //添加提交过来的数据
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) ->{
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);

    }
}
